Crusher frame



Oct. 4, 1966 L. G. sYMoNs 3,276,702

CRUSHER FRAME Original Filed Nov. 14, 1961 2 Sheets-Sheet 1 INVENTOR.

Get. 4, 1966 G. SYMONS 3,276,702

CRUSHER FRAME Original Filed Nov. 14, 1961 2 Sheets-Sheet 2 INVENTOR.

United States Patent Calif assignor to Milwaukee, Wis.,

This is a division of Serial No. 152,221, filed November 14, 1961 andissued as Patent No. 3,140,834 on July 14, 1964.

This invention is in the field of material reduction machines and isconcerned, among other things, with an improved gyratory crusher.

A primary object of the invention is an improved gyratory crusher whichis eflicient in use.

Another object is an adjustment or tilting ring and frame for a gyratorycrusher which avoids abrasive or adhesive wear on their contactingsurfaces.

Another object is an improved tilting ring and frame for a gyratorycrusher.

Other objects will appear from time to time in the ensuing specificationand drawings in which:

FIGURE 1 is a vertical section of a gyratory crusher; and

FIGURE 2 is a portion of FIGURE 1, on an enlarged scale.

In FIGURE 1, a crusher has been shown generally including the followingmain parts, a main frame A which supports a bowl structure B releasablyheld on the main frame by a release mechanism C and arranged to beadjusted by an adjustment mechanism D. The main frame also supports acrushing head E defining a crushing cavity with the bowl.

The main frame A includes abase flange with an upstanding housing 12 anda supporting flange 14 for the bowl structure at the upper end. The baseflange is connected to a center hub 16 by a Web structure 18. The centerhub supports an eccentric 20 which has a suitable counterweight 22 atits upper end overhanging the upper end of the center hub and connectedto a ring gear 23 by bolts 24 or the like, which in turn is driven by apinion 25 on a drive shaft 26 which in turn may be driven by a belt andpulley arrangement or any suitable means, not shown.

The bowl structure B may include an adjustment or tilting ring 100screw-threaded as at 102 to a bowl 104. As shown in FIGURE 2, theadjustment ring rests on and is supported by an upstanding annularflange 106 on the main frame with the two having opposed upwardly andinwardly directed or convergent contacting or abutting surfaces 108,108a which constitute the sole support or contact between the bowlstructure and frame. Each of the contacting surfaces includes an upperconic portion 110, 110a, shown as disposed at, roughly, a 45 angle tothe crusher axis, followed on the lower outside by separating inwardlycurved portions 112 on the adjustment ring and 114 on the frame. Theinwardly curved surfaces 112 and 114 may be formed each on a constantradius or they might be otherwise developed, depending upon the forcesinvolved. When the adjustment ring 100 tilts up at one side of thecrushing cavity due to uncrushable material in the cavity, the surfaces112 and 114 at the opposite side of the adjustment ring and framecontact, with the conic surfaces 110 separated. Within manufacturinglimits, the force should always be normal to the point of contactbetween the surfaces 112 and 114.

The curve 112 is swung on a somewhat greater radius than the curve 114,so that when the bowl tilts on one 3,276,702 Patented Oct. 4, 1966 iceside, the adjustment ring will roll on the other side with a smoothrolling contact with no slip between 112 and 114, without sliding orrubbing. At the upper inner end the conic surfaces separate, as at 116,and the adjustment ring includes a depending skirt 118 which is threadedon its inner surface and is spaced from the main frame, as at 120 inFIGURE 2, on its outer surface.

It will be realized that whereas a practical and operative device hasbeen described and claimed, nevertheless many changes may be made in thesize, shape, number and disposition and relation of parts withoutdeparting from the spirit of the invention. It is, therefore, wishedthat the description and drawings be taken as in a broad senseillustrative or diagrammatic rather than as limiting to the preciseshowing.

The use, operation and function of the invention are as follows:

In prior crushers, the contacting surfaces between the main frame andthe tilting ring have been conical and disposed small end down, such asshown in US. Patent No. 3,019,994. That particular arrangement has ledto a cavitating or pitting condition, resulting from what is known asskid welding, between the opposed surfaces requiring all sorts ofexpensive repairs involving welding, grinding, excessive down time, atgreat expense and trouble. Repairing these surfaces requires that thebowl and adjustment ring be taken off, which means that the crusher isdown. This can involve days and weeks of lost time.

In the present arrangement, a rolling contact is provided whicheliminates this pitting or skid welding problem.

The adjustment ring 100 is normally maintained firmly pressed downwardlyagainst an upper edge portion of the main frame 12. The relationship ofthe parts is shown in detail in FIGURE 2. The entire supporting contactis provided normally by the opposed conic surfaces 110. During normalcrushing, the entire bowl support is, therefore, provided by the outersurface of the main frame flange 106, which, as is clear from FIGURES 1and 2, is generally conic. However, when uncrushable material is presentin the crushing cavity, the ring 100 is lifted, at one side of thecavity, in such fashion as to separate the opposed conic surfaces ofring and main frame flange. A rolling outside contact is providedbetween the opposed surfaces 112 and 114. In any event, it is thecontact of the ring 100 with some part of the outer surface of theflange 106 which constitutes the sole supporting connection between thebowl structure as a Whole and the main frame. This is in contrast toprevious structures, such as are shown, for example, in Patent No.2,358,038, Symons et al., dated September 12, 1944, in which asimultaneous contact is indicated between the exterior and interiorfaces of the main frame flange and the exterior and inner faces of achannel in a corresponding adjustment ring. In the structure of theabove mentioned patent, during normal crushing the adjustment ring hasan inner portion which fits like a cork or stopper within a surroundingsurface of the main frame. It turns out, in practice, that it isdiflicult, eflectively, to maintain any such double contact. The attemptto do so causes difliculties of wear and damage to the opposed partswhich, in practice, are extreme.

I claim:

1. In a gyratory crusher, a main frame, a bowl structure supported onthe main frame, and means for releasably supporting the bowl structureon the main frame, including upwardly and inwardly extending generallyconic circumferential contacting surfaces constituting the solesupporting contact between the bowl structure and main frame duringnormal operation, the contacting surfaces including an intermediateportion which, in vertical cross section, is generally rectilinear, andnormally noncontacting concave-convex generally arcuate sectionsextending downwardly and outwardly therefrom, and yielding means fornormally holding the generally rectilinear surfaces in contact.

2. The structure of claim 1 further characterized in that theconcave-convex generally arcuate sections are developed such that whensuch surfaces are in contact due to the bowl structure rising away fromthe frame on one side, the force between such surfaces will be generallynormal to the point of contact there/between.

3. The structure of claim 1 further characterized in that the normallynon-contacting concave-convex arcuate sections are swung on differentbut sufiiciently close radii such that they contact when the bowlstructure is tilted up only a small amount on one side.

References Cited by the Examiner UNITED STATES PATENTS 2/1939 Fahrenwald24l2l5 1/1955 Traylor 241209 ROBERT C. RIORDON, Primary Examiner.

15 D KELLY, Assistant Examiner.

1. IN A GYRATORY CRUSHER, A MAIN FRAME, A BOWL STRUCTURE SUPPORTED ONTHE MAIN FRAME, AND MEANS FOR RELEASABLY SUPPORTING THE BOWL STRUCTUREON THE MAIN FRAME, INCLUDING UPWARDLY AND INWARDLY EXTENDING GENERALLYCONIC CIRCUMFERENTIAL CONTACTING SURFACES CONSTITUTING THE SOLESUPPORTING CONTACT BETWEEN THE BOWL STRUCTURE AND MAIN FRAME DURINGNORMAL OPERATION, THE CONTACTING SURFACES INCLUDING AN INTERMEDIATEPORTION WHICH, IN VERTICAL CROSS SECTION, IS GENERALLY RECTILINEAR, ANDNORMALLY NONCONTACTING CONCAVE-CONVEX GENERALLY ARCUATE SECTIONSEXTENDING DOWNWARDLY AND OUTWARDLY THEREFROM, AND YIELDING MEANS FORNORMALLY HOLDING THE GENERALLY RECTILINEAR SURFACES IN CONTACT.